LTC1403-1 LINER [Linear Technology], LTC1403-1 Datasheet

no-image

LTC1403-1

Manufacturer Part Number
LTC1403-1
Description
Serial 12-Bit/14-Bit, 2.8Msps Sampling ADCs with Shutdown
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIO S
BLOCK DIAGRA
10 F
A
A
2.8Msps Conversion Rate
Low Power Dissipation: 14mW
3V Single Supply Operation
2.5V Internal Bandgap Reference can be Overdriven
3-Wire Serial Interface
Sleep (10 W) Shutdown Mode
Nap (3mW) Shutdown Mode
80dB Common Mode Rejection
Tiny 10-Lead MSE Package
Communications
Data Acquisition Systems
Uninterrupted Power Supplies
Multiphase Motor Control
Multiplexed Data Acquisition
IN
IN
1.25V Bipolar Input Range
+
1
2
3
4
LTC1403A-1
V
GND
REF
5
+
S & H
6
U
REFERENCE
2.5V
W
14-BIT ADC
11
10 F
EXPOSED PAD
3V
7
V
DD
14
Sampling ADCs with Shutdown
OUTPUT
THREE-
SERIAL
TIMING
STATE
LOGIC
PORT
DESCRIPTIO
The LTC
serial ADCs with differential inputs. The devices draw only
4.7mA from a single 3V supply and come in a tiny 10-lead
MSE package. A Sleep shutdown feature lowers power
consumption to 10 W. The combination of speed, low
power and tiny package makes the LTC1403-1/LTC1403A-1
suitable for high speed, portable applications.
The 80dB common mode rejection allows users to elimi-
nate ground loops and common mode noise by measuring
signals differentially from the source.
The devices convert –1.25V to 1.25V bipolar inputs differ-
entially. The absolute voltage swing for +A
–A
The serial interface sends out the conversion results
during the 16 clock cycles following CONV for compat-
ibility with standard serial interfaces. If two additional
clock cycles for acquisition time are allowed after the data
stream in between conversions, the full sampling rate of
2.8Msps can be achieved with a 50.4MHz clock.
Serial 12-Bit/14-Bit, 2.8Msps
, LTC and LT are registered trademarks of Linear Technology Corporation.
10
8
9
IN
14031 BD
extends from ground to the supply voltage.
SDO
CONV
SCK
®
1403-1/LTC1403A-1 are 12-bit/14-bit, 2.8Msps
LTC1403-1/LTC1403A-1
U
–104
–44
–50
–56
–62
–68
–74
–80
–86
–92
–98
0.1
THD, 2nd and 3rd vs Input
Frequency for Differential Input
Signals
FREQUENCY (MHz)
1
THD
10
3rd
2nd
IN
14031 G19
14031f
and
1
100

Related parts for LTC1403-1

LTC1403-1 Summary of contents

Page 1

... MSE package. A Sleep shutdown feature lowers power consumption The combination of speed, low power and tiny package makes the LTC1403-1/LTC1403A-1 suitable for high speed, portable applications. The 80dB common mode rejection allows users to elimi- nate ground loops and common mode noise by measuring signals differentially from the source ...

Page 2

... NUMBER LTC1403CMSE-1 TOP VIEW 10 CONV LTC1403IMSE-1 9 SCK LTC1403ACMSE SDO LTC1403AIMSE-1 6 GND MSE PART MARKING = 150 LTBGP LTBGQ LTBGR LTBGS = 3V DD LTC1403-1 LTC1403A-1 TYP MAX MIN TYP MAX 14 0.25 2 –4 0 – – MIN ...

Page 3

... A DD OUT V = 2.7V 1.6mA DD OUT OUT 0V OUT OUT DD LTC1403-1/LTC1403A-1 – = 1.5V DC. Differential signal drive with IN LTC1403-1 LTC1403A-1 MIN TYP MAX MIN TYP MAX 70.5 73.5 68 70.5 70 73.5 72 76.3 72 76.3 –87 –90 –83 –76 –86 –78 –87 –90 –83 – ...

Page 4

... Note 17 Note 18: The LTC1403A-1 is measured and specified with 14-bit – = 1.5V DC while Resolution (1LSB = 152 V) and the LTC1403-1 is measured and specified IN with 12-bit Resolution (1LSB = 610 V). must be within this range. Note 19: Full-scale sinewaves are fed into the noninverting input while the inverting input is kept at 1 ...

Page 5

... Sine Wave 4096 Point FFT Plot 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 0 350 700k 1.05M FREQUENCY (Hz) 14031 G05 LTC1403-1/LTC1403A 3V. Single ended SFDR vs Input Frequency 104 100 ...

Page 6

... LTC1403-1/LTC1403A TYPICAL PERFOR A CE CHARACTERISTICS – with A = 1.5V DC, differential signals drive both inputs with V IN 1.4MHz Input Summed with 1.56MHz Input IMD 4096 Point FFT Plot for Differential Input Signals 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 – ...

Page 7

... FREQUENCY (Hz) Reference Voltage 2.4902 2.4900 2.4898 2.4896 2.4894 2.4892 2.4890 2.0 2.6 2.8 3.0 3.2 3.4 V (V) DD LTC1403-1/LTC1403A (LTC1403-1 and LTC1403A- PSRR vs Frequency –25 –30 –35 –40 –45 –50 –55 –60 –65 – 100 1k 10k FREQUENCY (Hz) 14031 G13 V Supply Current vs ...

Page 8

... LTC1403-1/LTC1403A CTIO (Pin 1): Noninverting Analog Input fully differentially with respect to A 1.25V differential swing with respect common mode swing. DD – A (Pin 2): Inverting Analog Input differentially with respect to A with a 1.25V to –1.25V IN differential swing with respect to A common mode swing ...

Page 9

... D10 14-BIT DATA WORD t CONV t THROUGHPUT Nap Mode and Sleep Mode Waveforms t 1 SCK to SDO Delay SCK SDO V OL LTC1403-1/LTC1403A ACQ SAMPLE HOLD Hi 14031 TD01 ...

Page 10

... During conversion, the analog inputs draw only a small leakage current. If the source impedance of the driving circuit is low, then the LTC1403-1/ LTC1403A-1 inputs can be driven directly. As source imped- ance increases, so will acquisition time. For minimum acqui- sition time with high source impedance, a buffer amplifier must be used ...

Page 11

... REF GND Figure 1. RC Input Filter INPUT RANGE The analog inputs of the LTC1403-1/LTC1403A-1 may be driven fully differentially with a single supply. Each input may swing individually. In the conversion P-P range, each input is always up to 1.25V more positive or more negative than the inverting input of each channel. ...

Page 12

... FS – 1.5LSB). The output code is natural binary with 1LSB = 2.5V/16384 = 153 V for the LTC1403A-1, and 1LSB = 2.5V/4096 = 610 V for the LTC1403-1. The LTC1403A-1 has 1LSB RMS of random white noise. Figure 6a shows the LTC1819 converting a single ended input signal to differential input signals for optimum THD and SFDR performance as shown in the FFT plot (Figure 6b) ...

Page 13

... FREQUENCY (Hz) Figure 6b. LTC1403-1 6MHz Sine Wave 4096 Point FFT Plot with the LT1819 Driving the Inputs Differentially Board Layout and Bypassing Wire wrap boards are not recommended for high resolu- tion and/or high speed A/D converters. To obtain the best performance from the LTC1403-1/LTC1403A-1, a printed circuit board with ground plane is required ...

Page 14

... Conversion Start Input (CONV) The rising edge of CONV starts a conversion, but subse- quent rising edges at CONV are ignored by the LTC1403-1/ LTC1403A-1 until the following 16 SCK rising edges have occurred necessary to have a minimum of 16 rising edges of the clock input SCK between rising edges of CONV ...

Page 15

... The ADC’s serial data can be collected in two alternating 1kB segments, in real time, at the full 2.8Msps conversion rate of the LTC1403-1/ LTC1403A-1. The DSP assembly code sets frame sync mode at the BFSR pin to accept an external positive going pulse and the serial clock at the BCLKR pin to accept an external positive edge clock ...

Page 16

... LTC1403-1/LTC1403A APPLICATIO S I FOR ATIO ; 10-23-03 ****************************************************************** ; Files: 014SI.ASM -> 1403 bipolar Sine wave collection with Serial Port interface ; bvectors.asm buffered mode. ; s2k14ini.asm 2k buffer size. ; first element at 1024, last element at 1023, two middles at 2047 and 0000 ; bipolar mode ; Works clock frames. ...

Page 17

... BSP vectors ;Set address of BSP buffer for clearing ;Set address of result for clearing * DO NOT MODIFY IF USING DEBUGGER * * DO NOT MODIFY IF USING DEBUGGER * LTC1403-1/LTC1403A-1 10.Jul.96 * 14031f 17 ...

Page 18

... LTC1403-1/LTC1403A APPLICATIO S I FOR ATIO int2 return_enable ;48; external interrupt int2 nop nop nop tint return_enable ;4C; internal timer interrupt nop nop nop brint goto breceive ;50; BSP receive interrupt nop nop nop bxint goto bsend ;54; BSP transmit interrupt nop nop nop ...

Page 19

... BSPCE and ABU ; initializes transmit buffer start address ; initializes transmit buffer size ; initializes receive buffer start address ; initializes receive buffer size ; bring buffered serial port out of reset ;for transmit and receive because GO=0xC0 LTC1403-1/LTC1403A B13 B12* * DLB bit ...

Page 20

... LTC1403-1/LTC1403A-1 PACKAGE DESCRIPTIO DETAIL “A” 0.254 (.010) 0 – 6 TYP GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL “A” 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006" ...

Related keywords